Tesis
Temperatura base, crescimento, desenvolvimento de crambe (Crambe abyssinica Hochst ex R.E. Fries)
Fecha
2012-02-28Registro en:
SILVEIRA, Tatiani Reis da. Based temperature, growth and development of crambe(Crambe abyssinica Hochst ex RE Fries). 2012. 67 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Santa Maria, Santa Maria, 2012.
Autor
Silveira, Tatiani Reis da
Institución
Resumen
The crambe is an oilseed that belongs to the Brassicaceae family, is considered a
winter crop, with good tolerance to frost. In the state of Rio Grande do Sul, missing
information on the growth, development and adaptation of crambe, which limits the
adoption by producers of culture. The knowledge of thermal and base temperature
scale allows the crop cycle, helping to define the sowing date and correct timing of
the implementation of management practices. Thus, this study aims to evaluate and
characterize the growth and development of crambe, to determine the thermal over
the cycle and by different methods to estimate the base temperature for the cultivar
Brilliant FMS. An experiment was conducted at the Federal University of Santa Maria,
in the years 2010 and 2011, the following sowing dates: 06/10/2010, 07/05/2010,
08/03/2010, 08/19/2010, 09/09/2010, 09/17/2010, 02/18/2011, 04/06/2011,
04/28/2011, which was evaluated twice a week the phenological stage of the height
and number of leaves of 20 plants each time. Using daily temperature data, we
calculated the basis for the subperiods temperature sowing-emergence, emergence,
flowering, fruiting, flowering, fruit-maturation and maturation-emergency, by
traditional methods: a smaller deviation in degree-days, the lower standard deviation
days, X-intercept, coefficient of variation in degree-day coefficient of variation in days
and the regression coefficient; by methods modified by Yang et al. (1995), which are
offset in degree-days, lower standard deviation in days , coefficient of variation in
degree-days and the regression coefficient, and proposed new methods: pseudopseudo-
sigma and sigma in days. The method estimated more accurately subperiods
higher, with the temperature average basis for emergency subperiod maturation of
4.5 ° C. The increase both in height and in the number of sheets is down to 300 °
days, thereafter the plants grew faster variable up to about 900 ° days, when the
stabilizing time and the number of sheets decreases because of senescence.